The current import of the OffscreenCanvas tests misses the 'manual' directory, that includes a lot of important OffscreenCanvas tests. Opening this bug to refresh the import and include them.
Created attachment 406295 [details] Patch
Created attachment 406302 [details] Patch
Committed r265436: <https://trac.webkit.org/changeset/265436> All reviewed patches have been landed. Closing bug and clearing flags on attachment 406302 [details].
<rdar://problem/66787275>